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Another famous example is that Bishop Tobin of the Diocese of Providence, Rhode Island, sent a private letter to then Congressman Patrick Kennedy informing him that abortion was wrong and that he must repent of that.

Congressman Patrick Kennedy took the letter public and then became an 'ex-congressman' because of the public furor over the congressman's stance.

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Link to news about ex-congressman Patrick Kennedy and Bishop Tobin:

Bishop Tobin to Congressman Patrick Kennedy: ´What does it mean to be a Catholic?´

The first sentence of the article is important:

our rejection of the Church´s teaching on abortion falls into a different category - it´s a deliberate and obstinate act of the will; a conscious decision that you´ve re-affirmed on many occasions.